Here were the warning signs I should have listened to:

1) Obsessively thinking about the therapist
2) Not functioning well between sessions
3) Over-valuing the relationship compared to other, more 'real' relationships
4) Distancing myself from friends and family members
5) Wishing the therapist was my parent
6) Longing for the therapist whenever I felt upset
7) Feeling like I won the lottery when the therapist emailed
8) Decreased interest in work
9) Feeling like a child who lost their mommy when the therapist went on a vacation
10) Excessively internet researching the therapist
11) Distress seeing other clients
12) Distress if the sessions didn't go perfectly
13) Distress thinking about therapy ending someday

See? Not healthy. Something had to change.